Abstract
The time response of photon-stimulated desorption (PSD) of excited-state alkali atoms from alkali halides has been investigated with synchrotron radiation pulses. It was found that the substance having a larger Rabin-Klick parameter shows a larger efficiency of the fast desorption. It was also found that there is a delay for the fast PSD, indicating the existence of the precursor state. It is proposed that the fast desorption may be produced by electronic transition in the surface layer, while the slow desorption may be due to the thermal instability of surface defects.
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